In this paper,effects of litter aqueous extracts on seed germination and seedling growth of two dominant tree species were investigated in the mixed stand of Larix principis-rupprechtii and Picea wilsonii (Picea meyeri). The results were as follows. 1) Germination of two species were both inhibited by all types of aqueous extracts. The most obvious inhibition was presented by 50.0 g/ L aqueous extracts of L. principis-rupprechtii or P. wilsonii (P. meyeri). 2) Seedlings of L. principis-rupprechtii were promoted by aqueous extracts of L. principis-rupprechtii needles or Betula platyphylla barks, while they were inhibited by aqueous extracts of P. wilsonii (Picea meyeri) needles. 3) Seedlings of P. wilsonii (Picea meyeri) were inhibited by aqueous extracts of B. platyphylla barks, while they were enhanced by lower concentrations and inhibited by higher concentrations of aqueous extracts by other three litter types. 4) Biomass of L. principis-rupprechtii was improved by aqueous extracts of B. platyphylla barks at concentrations of 5.0 and 12.5 g/ L, but not at concentrations of 25.0 and 50.0 g/ L. 5) Biomass of P. wilsonii was inhibited by all types of the aqueous extracts. 6) Four types of litterfall aqueous extracts totally inhibited seeds germination and seedling growth of both species, but the effect on P. wilsonii was stronger than that on L. principis-rupprechtii.